Finding the Fourth Proportional to 10,809.72, 14,911.02 and 8,148.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,809.72 : 14,911.02 = 8,148.78 : x
2. Step 2: Convert to fraction form
   10,809.72/14,911.02 = 8,148.78/x
3. Step 3: Cross multiply
   10,809.72x = 14,911.02 × 8,148.78
4. Step 4: Simplify right side
   10,809.72x = 121,506,621.56
5. Step 5: Solve for x
   x = 121,506,621.56/10,809.72
6. Step 6: Final answer
   x = 11,240.50